The two amplitudes \(t_1\)  and \(t_2\)  from the two different reaction mechanisms play a vital role in the decays of \(B^{0(+)}\rightarrow K^{0(+)}X(3872)\) . The total decay widths read [1]}
\(\Gamma _{B^0\rightarrow K^0X(3872)} &=& \frac{1}{8\pi }\frac{|{q}|^3}{M^2_X} \times \\&& \left( g_{BKX}^2 + g^2_{B^0} |G_{D^+D^{\ast -}}|^2 \right), \\&& = \Gamma ^{\rm I}_{B^0} + \Gamma ^{\rm II}_{B^0}, \\\Gamma _{B^+\rightarrow K^+X(3872)} &=& \frac{1}{8\pi }\frac{|{q}|^3}{M^2_{X}} \times \\&& \left( g_{BKX}^2 + g^2_{B^+} |G_{D^0D^{\ast 0}}|^2 \right), \\&& = \Gamma ^{\rm I}_{B^+} + \Gamma ^{\rm II}_{B^+}, \) 
